Putra, R.A. et al. 2017. Heme Oxygenases1 (Hmox1) and Serum Ferritin Level between Preeclampsia and Normal Pregnancy. Indonesian Journal of Obstetrics and Gynecology. 5, 1 (Jun. 2017), 8–11. DOI:https://doi.org/10.32771/inajog.v5i1.457.